What about driving it at full tilt in A2?:
The driving signal has to be about 160Vpp to provide maximum swing, so power is:
H2 distortion:
Which yields a whooping 6%!
Driving the 45 in A2 (Part3)
All about electronic valves and hi-fi
What about driving it at full tilt in A2?:
The driving signal has to be about 160Vpp to provide maximum swing, so power is:
H2 distortion:
Which yields a whooping 6%!
It is not bad at all! If you drive in the same way the 2A3 or the 300B won’t get less distortion. Consider 3W as max Pout and THD will be 5% or less. This is usually the amount for comparing SE Pout’s, unless specified. It’s 50-to-100% more than datasheet 45 amps and the classic 2A3 amp gets only 0.5W more.
You are right. It’s actually 4% given distortion cancellation with the driver. So driven at normal music levels, I could actually get a tad more power which is what I’d like on my current 45SE….
Hi Ale,
revisiting this simulation it seems to me the swing is not symmetric. I was wondering why you get worse results than I get in reality……
It seems to be 75V peak on the right side and 80V peak on the left (towards positive grid). In other words what you indicate as Vgk = -135V is actually -130V. If you do +/-75V, you will get something like 3.1W with 4% with less A2 drive!
Yes, correct. I would need to trace the 45 curves in A2 to see what is real performance in A2. Not convinced is the way to go. Probably easier (and better) to run them in PSE or go for the PP version instead.